An air conditioner can cool the hall in 40 minutes while another takes 45 minutes to cool under similar conditions. If both air conditioners are switched on at the same time then how long will it take to cool the room approximately? (A) 18 minutes (B) 19 minutes (C) 22 minutes (D) 24 minutes

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What is the formula of \[{x^2} + {y^2} + {z^2}?\

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What is the value of $ 5 $ million dollars in Indian rupees given that one dollar is equal to $ 75 $ Indian rupees.

How many perfect cubes can you find from 1 to 100? How many from -100 to 100?